Emission mechanism of mixed-color InGaN/GaN multi-quantum-well light-emitting diodes

Shih Chang Shei, Jinn Kong Sheu, Chi Ming Tsai, Wei Chi Lai, Ming Lun Lee, Cheng Huang Kuo

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

In this study, GaN-based light-emitting diodes (LEDs) were designed with a multi-quantum-well active region, including a yellow-green and a blue quantum well in each period. Photoluminescence (PL) and electroluminescence (EL) measurements revealed two emission bands (at λ∼ 450 and 560 nm) originating from the two well regions. The ratio of blue to yellow-green emission intensities changes with the excitation intensity. In EL, the intensity of the blue emission peak exceeds that of the yellow-green emission peak when a low DC current (I 40mA) is applied. However, when a high pulsed current is applied (I ≧ 100mA) to the LEDs, the intensity of the yellow-green band exceeds that of the blue band, because of the competition between carrier tunneling and band-to-band recombination.

Original languageEnglish
Pages (from-to)2463-2466
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number4 A
DOIs
Publication statusPublished - 2006 Apr 7

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Electroluminescence
Semiconductor quantum wells
Light emitting diodes
light emitting diodes
quantum wells
Color
color
Photoluminescence
electroluminescence
direct current
photoluminescence
excitation

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "In this study, GaN-based light-emitting diodes (LEDs) were designed with a multi-quantum-well active region, including a yellow-green and a blue quantum well in each period. Photoluminescence (PL) and electroluminescence (EL) measurements revealed two emission bands (at λ∼ 450 and 560 nm) originating from the two well regions. The ratio of blue to yellow-green emission intensities changes with the excitation intensity. In EL, the intensity of the blue emission peak exceeds that of the yellow-green emission peak when a low DC current (I 40mA) is applied. However, when a high pulsed current is applied (I ≧ 100mA) to the LEDs, the intensity of the yellow-green band exceeds that of the blue band, because of the competition between carrier tunneling and band-to-band recombination.",
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Emission mechanism of mixed-color InGaN/GaN multi-quantum-well light-emitting diodes. / Shei, Shih Chang; Sheu, Jinn Kong; Tsai, Chi Ming; Lai, Wei Chi; Lee, Ming Lun; Kuo, Cheng Huang.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 45, No. 4 A, 07.04.2006, p. 2463-2466.

Research output: Contribution to journalArticle

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AU - Kuo, Cheng Huang

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